package study.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;

/**
 * Created by RoyDeng on 17/7/20.
 */
public class HttpServer {

    private final int port;

    public HttpServer(int port) {
        this.port = port;
    }

    public static void main(String[] args) throws Exception {
//        if (args.length != 1) {
//            System.err.println(
//                    "Usage: " + HttpServer.class.getSimpleName() +
//                            " <port>");
//            return;
//        }
//        int port = Integer.parseInt(args[0]);
        int port = 8080;
        System.out.printf("listen in localhost:%d\n", 8080);
        new HttpServer(port).start();
    }

    public void start() throws Exception {
        ServerBootstrap b = new ServerBootstrap();
        NioEventLoopGroup group = new NioEventLoopGroup();
        b.group(group)
            .channel(NioServerSocketChannel.class)
            .childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch)
                    throws Exception {
                    System.out.println("initChannel ch:" + ch);
                    ch.pipeline()
                        .addLast("decoder", new HttpRequestDecoder())   // 1
                        .addLast("encoder", new HttpResponseEncoder())  // 2
                        .addLast("aggregator", new HttpObjectAggregator(512 * 1024))    // 3
                        .addLast("handler", new HttpHandler());        // 4
                }
            })
            .option(ChannelOption.SO_BACKLOG, 128) // determining the number of connections queued
            .childOption(ChannelOption.SO_KEEPALIVE, Boolean.TRUE);

        b.bind(port).sync();
    }
}
